I know this is a few weeks old, but I am more curious as to how he got the details of your old car?
Are you sure you weren't specifically targeted for this scam?
Also, just to let you know, a little known secret - bank account numbers aren't sequential. They are randomly generated to prevent a scenario such as yours happening.
I can bet you that there will never ne a sort code and account number with just one number differential that exists.
He's full of the brown stuff.
Report him to the police to ensure that this scam does not reach another innocent and easily duped sex worker.